Transmitter-arm.



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PATENTED JULY 21,1903.

TRANSMITTER ARM.

APPLIQA'E'MNI mum APR. 6, 1903.

N0 MODEL.

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I E AL LL W1111AM KAlEhNE- I Am UNITED STATES- Patented July 21, 1903.

PATENT OFFICE.

WILLIAM KAISLING, OF CHICAGO, ILLINOIS, ASSIGNOR TO STROMBERG- CARLSON TELEPHONE MANUFACTURING COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

TRANSMITTER-ARM.

SPECIFICATION forming part of Letters Patent N0. 733,970, dated July 21, 1903.

Application filed April 6, 1903- Serial No. 151.400. (1T0 model.)

To all whom it may concern:

Be it known that 1, WILLIAM KAISLING, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Transmitter-Arms, of which the following is a full, clear, concise, and eX- act description, reference being bad to the accompanying drawings, forming apart of this specification.

My invention relates to substation tele phone apparatus, and particularly to a device to be employed for the purpose of adj ustably mounting the telephone-transmitter upon the backboard of the telephone set.

Residence telephone sets are frequently mounted in a narrow passage-way, whereby the projecting parts of the set, such as the transmitter, are very subject to injury, due to knocks received from persons passing the instrument. It is desirable that the telephone-transmitter be adjustably mounted, so that by a suitable vertical movement its position can be adapted to the'height of the person using the telephone.

'1 am aware that it has heretofore been proposed to mount the transmitter by means of a hinge-joint upon the backboard, whereby a swinging movement of the transmitter-arm permits the transmitter to be raised or lowered to any desired height within its range of movement; but such adjustable mounting means as have heretofore been employed have been of such length that the transmitter projects to an undesirably great distance from the backboard.

It is the principal object of my invention to provide a substantial swinging support for a telephone-transmitter which shall allow a comparatively large movementof the transmitter, but which at the same time shall not cause the transmitter to'project an undesirably great distance from the backboard. I further provide means whereby the stilfness of the hinge-joint may be varied at will to suit the desires of the person using the telephone and to take up wear in the moving parts. My invention provides means for accomplishing these objects by the use of a deeration, and of low cost of manufacture.

My invention will he more clearly understood by reference to the accompanying drawings, in which- 7 Figure 1 illustrates a transmitter adjustably mounted upon a backboard by means of my improved device. Fig. 2 is a cross-sec.- tional view taken on line 2 2 of Fig. 1 and illustrating in elevation my improved mounting mechanism. Fig. 3 is a central longitudinal cross-sectional view taken on line 3 3 of Fig. l.

I have illustrated a backboard 4, to which the base-plate 5 is secured by means of the screws 6 6. A circular opening 7 is cut, in the backboard for the reception of the cylindrical projection 8 on the back of the baseplate 5. A circular opening 9 in the baseplate provides for the reception of the spherical end portion 10 of the transmitter-mount 11, which, as illustrated, is preferably provided with an opening 12 for the accommodation of conductor-wires. (Not shown.) A hinge-pin 13 extends through the center of the spherical end portion 10, its projecting ends 14 14 resting in suitable bearings 15 15 in the front of the base-plate 5. A stamped springmetal escutch'eon plate 16 is provided with an opening 17 to accommodate the spherical end portion 10 of the transmittermount and with stamped sockets 18 18, adapted'to accommodate the projecting ends 14 upon the backboard in such a. manner that.

the mouthpiece may be swung through a large arc of movement to accommodate its use by persons of greatly difiering heights. At the vice which is simple, compact, reliable in opsame time the means of adjustable mounting I is such that the transmitter projects but a comparatively small distance from the front of the backboard 4.-.

The device hereinbefore described also pro vides means whereby the compression of the hinge-pin 13 may be varied by means of the screws 19 19 to vary the stiifness of the hingejoint as desired. I

My invention further provides a transmittor-mounting of neat and pleasing appearance and one which cannot readily get out of order.

What I claim as new, and desire to secure by Letters Patent, is'

1. In a device of the class described, the combination with a backboard, of a baseplate secured thereto, a transmitter-mount having a spherical end portion received in a suitable opening in said base-plate, a hingepin passing through the center of said spherical end portion having hinged ends lying in suitable bearings ins-aid base-plate, a springmetal escutcheon-plate adapted to cover said base-plate and said hinge-pin and having an opening for the reception of said spherical end portion of the transmitter-mount, sockets formed in said spring-metal escutcheonplate to accommodate the projecting ends of said hinge-pin, and screws for clamping said hinge-pin between said base-plate and said escutcbeon-plate with an adjustable pressure.

2. In a device of the class described, the combination with a backboard, of a baseplate secured thereto, a transmitter-mount having a spherical end portion received in a suitable circular opening in said base-plate, a hinge-pin passing through the center of said spherical end portion, and clamped thereto by means of a set-screw, said hinge-pin having projecting ends lying in suitable bearings in said, base-plate, a spring-metal es cutcheon-plate adapted to cover said baseplate and said hinge-pin and having a circular opening for the reception of said spherical end portion of said transmitter-mount, sockets formed in said spring-metal escutcheon-plate to accommodate the projecting ends of said hinge-pin, there being a slight intervening space between the front side of said base-plate and said escutcheon-plate, and screws for clamping said hinge-pin between said base-plate and the sockets formed in said escutcheon-plate with an adjustable pressure, the distance from the front of the backboard to the axis of said hinge-pin being made comparatively small.

In witness whereof I hereunto subscribe my name this 29th day of March, A. D. 1903.

WILLIAM KAIS-LING.

Witnesses:

LYNN A. WILLIAMS, HARVEY L. HANSON. 

